The sands are called zircon sands because they contain sand-sized mineral zircon grains. From Wordnik.com. [Zirconium] Reference
This double nitrate has a specific gravity of 4.7963, therefore such a stone as zircon, which is the heaviest known, will float in it. From Wordnik.com. [The Chemistry, Properties and Tests of Precious Stones] Reference
Tin oxide (SnO2) and zircon (ZrSiO4) are used for this. From Wordnik.com. [5. Simple glaze theory] Reference
The mineral zircon is the primary ore source of hafnium. From Wordnik.com. [Hafnium] Reference
Coastal Sands (recent): titanium, pig iron, zircon and silica. From Wordnik.com. [DRAFT MINERAL & ENERGY POLICY] Reference
Commercial opacifiers are normally extremely finely ground zircon. From Wordnik.com. [12. Developing glazes] Reference
Colorless true topaz is sometimes sold and artificially whitened zircon. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Blue zircon, however, has nearly adamantine luster and considerable fire. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
It is better to add the zircon to the frit, but this may not be practical. From Wordnik.com. [12. Developing glazes] Reference
If the zircon is finely ground, 15 minutes are sufficient for this operation. From Wordnik.com. [Scientific American Supplement, No. 441, June 14, 1884.] Reference
It would never do to let an expert see your zircon beside even a fair diamond. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
He reduced the mineral zircon to zirconium oxide in 1789, but never isolated the metal. From Wordnik.com. [Zirconium] Reference
The zircon, for example, is strongly doubly refracting, but shows hardly any dichroism. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Zirconium was named after the silicate mineral in which it was first discovered, zircon. From Wordnik.com. [Zirconium] Reference
Fine particles of zircon or tin oxide in the glaze scatter the light and produce opacity. From Wordnik.com. [5. Simple glaze theory] Reference
Try the same with some more materials that are available like talc, limestone and zircon. From Wordnik.com. [12. Developing glazes] Reference
Opacity is furthered by fine grinding and by adding zircon to the frit instead of the batch. From Wordnik.com. [13. Glaze oxides] Reference
Crucibles of nickel seem especially well adapted for the fusion of zircon in caustic alkalies. From Wordnik.com. [Scientific American Supplement, No. 441, June 14, 1884.] Reference
The kiln wash is made from either pure zircon mixed with water or with the addition of kaolin. From Wordnik.com. [1. Refractories] Reference
Most zircon (and, therefore, hafnium) is mined from titanium-rich, heavy-mineral sand deposits. From Wordnik.com. [Hafnium] Reference
If finely divided zircon is boiled for a long time with caustic lye, it is perceptibly attacked. From Wordnik.com. [Scientific American Supplement, No. 441, June 14, 1884.] Reference
Bigger items such as saggars would, with the addition of zircon, become too expensive and heavy. From Wordnik.com. [1. Refractories] Reference
For example, an opaque glaze can be made with boron and additions of lime, zinc oxide and zircon. From Wordnik.com. [5. Simple glaze theory] Reference
The color dispersion, too, is so high (86\% as great as in diamond) that the zircon has considerable. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
It is very probable that in this manner zircon might be entirely dissolved under a pressure of 10 atmospheres. From Wordnik.com. [Scientific American Supplement, No. 441, June 14, 1884.] Reference
It is only when no direct comparison is possible, and when the expert is not suspicious, that a zircon can deceive him. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Of this mixture four parts are taken to one of zircon, thoroughly mixed, and melted in a platinum crucible at a red heat. From Wordnik.com. [Scientific American Supplement, No. 441, June 14, 1884.] Reference
Of course, the use of the scientific tests of the earlier lessons will, at once, detect the character of a whitened zircon. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Finely ground zircon is quickly rendered soluble if fused with a mixture of potassium borofluoride and potassium carbonate. From Wordnik.com. [Scientific American Supplement, No. 441, June 14, 1884.] Reference
It is useless to deny that by the unaided eye one might be deceived into thinking that a fine brown zircon was a brown diamond. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Hence, it is easy to detect zircon by any of these tests if there is reason to suspect that it has been substituted for diamond. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Unfortunately the addition of zircon to the frit increases its melting point, making it more difficult to run it off the frit kiln. From Wordnik.com. [5. Simple glaze theory] Reference
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